2.17 Week4 Note
Circuitboard
Circuits program circuits. Circuitboard you load a program to another board.
PCB(Printed Circuit Board) fabrication
No use etching(蚀刻), but machining, which is good for prototyping and is not good for volume production.
Use 1/64 for the surface of the board, and 1/32 for cutting through (make edges).
The sequence：
- fixturing 装夹，紧固（用双面胶）
- underlay (衬底)
- orientation
- zeroing (针头刚好接触板面)
- set-screws (固定螺丝)
- lifetime
- deburring (去毛刺)
- cleaning
check this tutorial in detail, or a Video Walkthrough
PCB materials: FR1（made from natural fiber） for rigid, Kapton / #1 epoxy film(环氧胶膜) / #1126 copper tape(铜箔胶带) for flex (use vinyl cutter).
Design rules: width/spacing (15, 5 mils)
Components: through-hole(穿孔), surface-mount(表面贴装), chip-scale(封装). ATTINY44
Assembly: solder焊锡, make joints shiny and smooth
CAM: use fab modules to make the PCB